EP1482663A1 - Testverfahren eines optoelektrischen Wandlers - Google Patents

Testverfahren eines optoelektrischen Wandlers Download PDF

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Publication number
EP1482663A1
EP1482663A1 EP04001825A EP04001825A EP1482663A1 EP 1482663 A1 EP1482663 A1 EP 1482663A1 EP 04001825 A EP04001825 A EP 04001825A EP 04001825 A EP04001825 A EP 04001825A EP 1482663 A1 EP1482663 A1 EP 1482663A1
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EP
European Patent Office
Prior art keywords
optical
input signal
converter
duty cycle
testing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04001825A
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English (en)
French (fr)
Other versions
EP1482663B1 (de
Inventor
Markus Becht
Dieter Dr. Jurzitza
Harald Schöpp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Harman Becker Automotive Systems GmbH
Original Assignee
Harman Becker Automotive Systems GmbH
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Filing date
Publication date
Application filed by Harman Becker Automotive Systems GmbH filed Critical Harman Becker Automotive Systems GmbH
Priority to DE2003607601 priority Critical patent/DE60307601T2/de
Priority to AT04001825T priority patent/ATE336835T1/de
Publication of EP1482663A1 publication Critical patent/EP1482663A1/de
Application granted granted Critical
Publication of EP1482663B1 publication Critical patent/EP1482663B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems

Definitions

  • the invention concerns a method of testing an optical electrical converter which receives an optical input signal and provides an electrical output signal.
  • Such converters are typically employed in broadband high speed optical data communication networks which have found widespread use in transmitting audio and video data.
  • Optical electrical converters are components that vary its electrical output signal dependent on optical input signal, e.g. photo resistors, photo diodes or photo transistors. They are typically manufactured as highly integrated semiconductor components with a highly complex procedure that allows production of high volumes at low costs. The manufacturing process due to its complexity often produces failure rates in the range of 0.5% to 5%. Consequently, each component is tested before being sold by applying a test signal and monitoring the output signal to determine whether it lies in a given tolerance range.
  • the conventional performance test is insufficient insofar as certain failures in the converter only appear in a combination of special environmental conditions.
  • to do performance tests by applying various environmental influences e.g. temperature variations
  • the invention provides a method of testing an optical electrical converter as set forth in claim 1.
  • the invention is based on the idea of applying input signals with a parameter that is out of the specified application range. By doing so, the device under test (DUT) is forced to exhibit results that do not occur under normal environmental conditions. More specifically, when applying an input signal, which is "beyond the limits" of normal application range, the internal point of operation of the DUT is shifted to the extreme and will possibly even exhibit a failure mechanism. Thus, by evaluating the results, it is possible to distinguish between good devices and failure devices, as the performance of good and bad converters differ significantly from each other.
  • the input signal parameter is the duty cycle of the optical input signal.
  • a fixed duty cycle value which is used in actual operation of the converter (e.g. close to 50%)
  • a lower or higher duty cycle out of the application range defined by the limits of normal operation are applied to the device under test.
  • the optical input signal is a modulated signal with a non-modulated component superimposed.
  • the internal balancing of the DUT is shifted according to the level of non-modulated light.
  • the performance of the DUT exhibits similar effects as a variation of the duty cycle out of the normal specified application range.
  • an evaluation step of the result considers the distortion (e.g. timing distortion) and/or the noise of the output signal.
  • the evaluation step includes a comparison of the output signal with at least one nominal value or a given tolerance range.
  • optical input signals with two different duty cycles are applied to the DUT and the output signals in response thereto are evaluated.
  • the duty cycle either by a predetermined pattern or dynamically and evaluating the output signals, it is already possible to distinguish good from bad components, as the output signals of each converter under test will be affected by this stimulation.
  • Figure 1 shows an optical electrical converter 100, which is used as a component in optical data bus systems for audio and video transmission.
  • optical data networks have found widespread use and are typically standardized, such as IEEE 1394, D2B Optical , BYTEFLIGHT, FLEXRAY, MOST or SPDIF.
  • the converter 100 is exemplarily shown with the dashed line and includes a photo diode 101.
  • the photo diode 101 receives a positive voltage V cc and generates an input current I in to flow when an optical input signal is received by its photo sensitive surface.
  • the input current I in is subsequently converted in a current/voltage converter 103 before being applied to the negative input of an operational amplifier with feedback resistor 106 and input resistor 107.
  • the output of the operational amplifier is applied to an analog/digital converter 105 for outputting a digital signal.
  • the internal analog signals can not be accessed externally.
  • the converter is connected to a decoder or CPU 108.
  • a typical testing arrangement includes a store-and-evaluation unit 109 to determine whether the actual converter under test is a good part or failure part.
  • Figure 2 illustrates the steps of a testing method under application of an input signal with a parameter that is out of the normal application range. More specifically, an input signal is applied to the DUT with a parameter that is out of a specified application range being defined by the limits of normal operation characteristics of the converter (step 201). For example, the specified range for a normal operation for the duty cycle could be 45% to 55%. In this case, a signal having a low or high duty cycle out of the specified range, e.g. 30% or 70% could be applied, as illustrated in Figure 5 described below.
  • the respective output signal of the converter is stored and evaluated in step 202.
  • the timing distortion or the noise contained in the output signal could be stored and compared with at least one nominal value for a give tolerance range.
  • the internal balancing mechanism of the converter will be influenced such that it exhibits a significant difference in the performance of good and bad parts. This allows to separate good from bad parts very easily (step 203) without the need for applying environmental influences, such as temperature variations, in a specific combination.
  • FIG 3 a variant of the testing method is shown.
  • an input signal with a parameter out of the application range is applied to the DUT
  • an input signal with a superimposed non-modulated component is applied to the converter in step 301.
  • This achieves a similar effect as the application of an input signal "beyond the limits" of normal operation, namely resulting in a shift of the internal balancing of the device according to the level of the non-modulated optical input signal. Consequently, after evaluation of the output signal (step 302) the result of the testing procedure may be easily determined in step 303.
  • Figure 4 illustrates a testing procedure involving a modification of the duty cycle of the input signal. Whereas conventional methods only apply a test procedure with a fixed duty cycle close to that used in actual operation, the duty cycle is at least varied once.
  • step 402 Upon initial set of the duty cycle of the input signal in step 401, in a first evaluation step, it is checked whether the output signal lies within an allowable tolerance range (step 402). If the result is already negative, it is determined that a failure has been detected in the DUT. In case the output signal is within the allowable range, the duty cycle of the input signal is modified as indicated in step 403. Subsequently, it is again checked whether the output signal lies within the allowable tolerance range (step 404). In the event that the result is negative, i.e. that the output signal is outside the tolerance range, the DUT is determined to be a bad part. Finally, it is checked whether all parameters have been tested in step 405. If so, it is decided that the DUT is a good part, otherwise the procedure reiterates the steps 403 to 405.
  • Figure 5 shows in the upper half an example for a duty cycle and the specified application range defined by the limits of normal operation. More specifically, the duty cycle is close to 50% with a variation of 5%.
  • the input signals of the test procedure, according to the invention are shown.
  • the duty cycle takes either a low or high value (for instance 30% and 70%, respectively) that is clearly outside of the specified application range.
  • Such extreme settings of the duty cycle of the input signal will not damage the converter but influence the internal balancing mechanism in a way that the difference in performance between good and bad parts will be immediately apparent. Consequently, quick and reliable testing of the converters can be performed without applying a combination of environmental conditions.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Analogue/Digital Conversion (AREA)
  • Testing Or Measuring Of Semiconductors Or The Like (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Testing Of Individual Semiconductor Devices (AREA)
  • Light Receiving Elements (AREA)
EP04001825A 2003-05-05 2003-05-05 Testverfahren eines optoelektrischen Wandlers Expired - Lifetime EP1482663B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2003607601 DE60307601T2 (de) 2003-05-05 2003-05-05 Testverfahren eines optoelektrischen Wandlers
AT04001825T ATE336835T1 (de) 2003-05-05 2003-05-05 Testverfahren eines optoelektrischen wandlers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03010145A EP1475907B1 (de) 2003-05-05 2003-05-05 Opto-elektrisches Umsetzerprüfungsverfahren

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP03010145A Division EP1475907B1 (de) 2003-05-05 2003-05-05 Opto-elektrisches Umsetzerprüfungsverfahren

Publications (2)

Publication Number Publication Date
EP1482663A1 true EP1482663A1 (de) 2004-12-01
EP1482663B1 EP1482663B1 (de) 2006-08-16

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP03010145A Expired - Lifetime EP1475907B1 (de) 2003-05-05 2003-05-05 Opto-elektrisches Umsetzerprüfungsverfahren
EP04001825A Expired - Lifetime EP1482663B1 (de) 2003-05-05 2003-05-05 Testverfahren eines optoelektrischen Wandlers

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP03010145A Expired - Lifetime EP1475907B1 (de) 2003-05-05 2003-05-05 Opto-elektrisches Umsetzerprüfungsverfahren

Country Status (4)

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EP (2) EP1475907B1 (de)
JP (1) JP2004343107A (de)
AT (1) ATE304246T1 (de)
DE (1) DE60301558T2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007071596A1 (de) * 2005-12-21 2007-06-28 Robert Bosch Gmbh Verfahren, multimedia-einrichtung zum senden und/oder empfangen von multimedia-daten über ein datenübertragungssystem und gateway zum anschluss einer multimedia-einrichtung an ein datenübertragungssystem gemäss dem flexray-standard

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3923005B1 (de) * 2020-06-11 2024-08-07 NXP USA, Inc. Selbsttest von einem arbeitszyklusdetektor
CN116205637B (zh) * 2023-05-04 2023-07-21 广东须臾科技有限公司 基于物联网与工业大数据的智能工厂管理系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS573443A (en) * 1980-06-09 1982-01-08 Toshiba Corp Measuring device of nonlinear distortion for optical receiver
US5652668A (en) * 1993-02-04 1997-07-29 International Business Machines Corporation Automated system, and corresponding method, for determining average optical output power of electro-optic modules

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01267473A (ja) * 1988-04-19 1989-10-25 Nec Corp 集積回路試験回路
JPH06249922A (ja) * 1993-02-24 1994-09-09 Matsushita Electric Ind Co Ltd デューティサイクル制御装置
JPH09264780A (ja) * 1996-03-29 1997-10-07 Ando Electric Co Ltd 光検出器の直線性試験装置
JP2003149287A (ja) * 2001-11-07 2003-05-21 Sony Corp 半導体集積回路の検査方法及び検査装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS573443A (en) * 1980-06-09 1982-01-08 Toshiba Corp Measuring device of nonlinear distortion for optical receiver
US5652668A (en) * 1993-02-04 1997-07-29 International Business Machines Corporation Automated system, and corresponding method, for determining average optical output power of electro-optic modules

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 006, no. 060 (E - 102) 17 April 1982 (1982-04-17) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007071596A1 (de) * 2005-12-21 2007-06-28 Robert Bosch Gmbh Verfahren, multimedia-einrichtung zum senden und/oder empfangen von multimedia-daten über ein datenübertragungssystem und gateway zum anschluss einer multimedia-einrichtung an ein datenübertragungssystem gemäss dem flexray-standard

Also Published As

Publication number Publication date
ATE304246T1 (de) 2005-09-15
EP1475907A1 (de) 2004-11-10
DE60301558T2 (de) 2006-06-29
EP1482663B1 (de) 2006-08-16
JP2004343107A (ja) 2004-12-02
DE60301558D1 (de) 2005-10-13
EP1475907B1 (de) 2005-09-07

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